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Critical comments were lost in r349203. This patch seeks to restore

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the lost information in new comments.

Reported by: alc
Reviewed by: alc
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D20632
This commit is contained in:
Doug Moore 2019-06-15 04:30:13 +00:00
parent c749d68596
commit 4766eba1df
1 changed files with 17 additions and 6 deletions
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23
sys/vm/vm_map.c
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@ -2186,17 +2186,22 @@ _vm_map_clip_start(vm_map_t map, vm_map_entry_t entry, vm_offset_t start)
VM_MAP_ASSERT_LOCKED(map);
KASSERT(entry->end > start && entry->start < start,
("_vm_map_clip_start: invalid clip of entry %p", entry));
vm_map_simplify_entry(map, entry);
/*
* Split off the front portion -- note that we must insert the new
* entry BEFORE this one, so that this entry has the specified
* starting address.
* Create a backing object now, if none exists, so that more individual
* objects won't be created after the map entry is split.
*/
vm_map_simplify_entry(map, entry);
vm_map_entry_charge_object(map, entry);
/* Clone the entry. */
new_entry = vm_map_entry_create(map);
*new_entry = *entry;
/*
* Split off the front portion. Insert the new entry BEFORE this one,
* so that this entry has the specified starting address.
*/
new_entry->end = start;
entry->offset += (start - entry->start);
entry->start = start;
@ -2244,14 +2249,20 @@ _vm_map_clip_end(vm_map_t map, vm_map_entry_t entry, vm_offset_t end)
KASSERT(entry->start < end && entry->end > end,
("_vm_map_clip_end: invalid clip of entry %p", entry));
/*
* Create a new entry and insert it AFTER the specified entry
* Create a backing object now, if none exists, so that more individual
* objects won't be created after the map entry is split.
*/
vm_map_entry_charge_object(map, entry);
/* Clone the entry. */
new_entry = vm_map_entry_create(map);
*new_entry = *entry;
/*
* Split off the back portion. Insert the new entry AFTER this one,
* so that this entry has the specified ending address.
*/
new_entry->start = entry->end = end;
new_entry->offset += (end - entry->start);
if (new_entry->cred != NULL)